From: Taehee Yoo <ap420073@gmail.com>
Date: Mon, 11 Jun 2018 22:16:33 +0900
Subject: netfilter: nf_tables: use WARN_ON_ONCE instead of BUG_ON in
nft_do_chain()
Git-commit: adc972c5b88829d38ede08b1069718661c7330ae
Patch-mainline: v4.18-rc1
References: netfilter-stable-18_06_25
When depth of chain is bigger than NFT_JUMP_STACK_SIZE, the nft_do_chain
crashes. But there is no need to crash hard here.
Suggested-by: Florian Westphal <fw@strlen.de>
Signed-off-by: Taehee Yoo <ap420073@gmail.com>
Acked-by: Florian Westphal <fw@strlen.de>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
Signed-off-by: Jiri Slaby <jslaby@suse.cz>
---
net/netfilter/nf_tables_core.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
--- a/net/netfilter/nf_tables_core.c
+++ b/net/netfilter/nf_tables_core.c
@@ -186,7 +186,8 @@ next_rule:
switch (regs.verdict.code) {
case NFT_JUMP:
- BUG_ON(stackptr >= NFT_JUMP_STACK_SIZE);
+ if (WARN_ON_ONCE(stackptr >= NFT_JUMP_STACK_SIZE))
+ return NF_DROP;
jumpstack[stackptr].chain = chain;
jumpstack[stackptr].rule = rule;
jumpstack[stackptr].rulenum = rulenum;